Investigation of Multiply Composite Artificial Bars for Bragg Scattering of Water Waves
Investigation of Multiply Composite Artificial Bars for Bragg Scattering of Water Waves
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DOI：
10.1142/s0578563411002446
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发表时间：
2011-12
影响因子：
2.4
通讯作者：
L. Tsai;Yu-Shu Kuo;Y. Lan;T. Hsu;Wen-Jung Chen
中科院分区：
文献类型：
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作者：
L. Tsai;Yu-Shu Kuo;Y. Lan;T. Hsu;Wen-Jung Chen
从理论和实验两方面研究了多层复合人工杆对水波的Bragg散射。本文首次应用Miles理论导出了计算不同形状、间距、杆高、杆底面积和杆数的多层复合人工杆布拉格反射系数的一般公式。该理论为实际工程中多层复合材料杆的布拉格反射提供了精确的计算公式。在数值模型中，起伏振荡分量相对于底部斜率和曲率分量的扩展可以提高布拉格散射模拟的精度。在波浪水槽中进行了多个矩形人工沙条上的布拉格反射实验。解析解与缓坡方程演化方程（EEMSE）的数值模拟和室内试验结果吻合较好。研究了影响多人工杆优化组合以提高布拉格谐振带宽的参数。
The Bragg scattering of water waves by multiply composite artificial bars was investigated both theoretically and experimentally. Miles' theory is first employed to derive general formulae to calculate Bragg reflection coefficients for multiply composite artificial bars with different shapes, spacings, bar heights, bar footprint, and the number of bars. The theory provides explicit expressions in estimating Bragg reflections over multiply composite bars in practical engineering applications. The undulating oscillation components expanded with respect to the bottom slope and curvature components in the numerical model can increase the accuracy for the simulation of Bragg scattering. Experiments of Bragg reflection over multiply rectangular artificial bars were also conducted in a wave flume. Analytical solutions are in good agreement with numerical simulations of evolution equation of mild-slope equation (EEMSE) and laboratory experiments. Influence parameters that may lead to the optimal combination of a multiple artificial bar to increase the bandwidth of Bragg resonance were studied.